This guy teases me about marriage. Why?

This guy I knows mom always jokes and says me and her son are gunna get married. I used to think she just said it to me but then he texted me one day and brought up that we are supposedly getting married. At first I didn't know if he was accusing me of saying it or just teasing me. Than the other day in person with my parents he made a joke a bout us getting married. I would think a guy wouldn't bring that up because he wouldn't want the girl to think more of it.. I Just don't get why he even brings it up
This guy teases me about marriage. Why?
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